Drafting-machine.



H. J. BUCK.

DRAFTING MACHINE.

APPLICATION FILED OCT-1.1917.

Patented Mar. 18,1919

2 SHEETS-SHEET I.

INVENTOR H. J. BUCK.

DRAFTING MACHINE.

APPLICATION FILED OCT-1,1917.

1,297,?8, Pfitented Mar. 18,1919

2 SHEETS-SHEEI 2.

36 WITNESSES. INVENTOR Pin 77 j- HERMAN u. BUCK ATTORNEYS HERMAN J. BUCK, OF ELLWOOD CITY, PENNSYLVANIA.

nnArTINe-MAcHINE.

I Specification of Letters Patent.

Patented Mar. 18, 1919.

Application filed October 1, 1917. Serial No. 194,250.

Taa ll whom it may concern:

Be it known that I, HERMAN J. BUCK, a

citizen of the United States, resident of Ell of the type adapted to be attached to a,

drawing board, provided with a scale, .protractor. or ruler and used for drawing parallel lines. The scale is movableover any part of the drawing board but its angular position'is not changed, and my object is. to

make a machine that,will insure the angular position of the rule or straight edge whereby the lines will be parallel regardless of its location on the board.

A further object is to provide a machine of such construction whereby the same can be used at a greater angle without losing any of its rigidity or changing its angular p0- sitionv in the slightest degree, thereby securing a great accuracy and a wide range of efiiciency.

' Other objects of the invention will appear from the following detailed description.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointe out in the claims.

In the accompanying drawings forming part of this specification,

Figure lis'a plan view of the machine, showing parts partly broken away forclearness of illustration,

Fig. 2 is a side'elevation of the same,

Fig. 3 is an end viewv of the same,

Fig. 4 is a detail viewshowing the manner of securing the scale attachment,

Fig. 5 is an enlarged detail plan view of i the scale and the p-rotractor head, with parts removed and broken away.

Fig. 6 is a longitudinal sectional view of the same,

Fig. 7 shows an attachment for triangular.

' scales,

bracket 3, provided with ears 4 and 5. A

suitable pin 6 and a screw 7 form bearings 'for a plate 8. An extension 9 on said plate engages a screw 10 on a lug 11 on the bracket 3. This allows for an adjustment of the plate 8. A bar 12 is pivotally connected to the plate by a suitable pin 13. The opposite end of this bar has sultable pivotal connections 14 with. a similar bar 15, whose opposite end is provided with a bearing 16 for an extension 17 of a plate 18 forming the base for the drafting instruments; These pivotal connections are, preferably provided with ball bearings, as indicated at 16.

To give the plate 18 a parallel motion regardless of its location, parallel'bars or links of. ordinary construction have heretofore beenused and the result is that when the two sets of links are at an aglev less than a right angle to each other, one set. of these links will come in closer relation with one another and cause the plate with its drafting instruments mounted thereon to lose its rigidity and thereby change the angular position of the scale and cause the lines to be out of arallel. To overcome this inaccuracy and give positive parallel motion to the plate 18 regardless of its position on the board, I provided a small segment gear 19 pivoted at 16 and adjustably secured to the extension 17 by means of a bolt 20 within a slot 21 in the plate 17. Thus any slight .variation out of parallel to this plate can be secured.

Each of the bars 12 and 15 have-pivotally secured thereon large segment gears 22 and 23. The former has one end in mesh with the segment gear 19, while its opposite end meshes with an idle gear 24 mounted on the end in mesh with the gear 24 while its opposite end meshes with teeth of a segment 25 on the bearing13 and adjustably secured to the plate 8, by'means of. 'a bolt 26 and a slot 27. v i

It will be seen from the foregoing that when the plate 18 is moved anywhere along the boardits angular position w1ll not be changed.

I have shown segment gears, although if necessary full gears may be used if desired. Suitable guards 28, 29 and 30 are provided for the gears. The bearings 13, 14 and 16 may be of any sultable construction giving best results and the gears may be cut on an angle as shown, for accuracy.

to. 30 socket 62 at its end. The scale is free to 60 engages the under side of the plate 18.

The plate 18 is provided with a pin 31 suitably secured thereon, and a washer 32 is secured thereon by means of a screw 33. A spring 34 within said pin bears on the under side of the washer and interposed between said washer and the plate 18 is a protractor plate 35, having the usual graduations 35. Secured to said protractor plate is a plate 36 to which are secured the proper drafting instruments. I have here sholwn the plate 36 provided with lugs 36 bent downwardly to engage projecting lugs 37 on a plate 38 secured to the end of the scale, straight edge, or rule 39. A similar lug projecting upwardly has a screw 40 to engage the lug 37,

thussecuring the scale to a-plate 36. Adjustments can be thus secured for the scale to cause the same to lie flat upon the board. The scale can be provided with an attachment at each end if required. Lugs 41, similar to the lugs 36, are located on the plate 36 at right angles to the latter and a scale 42 maybe used for making vertical lines.

In Fig. 7 I have shown the plate 36 provided with an extension 57 to which is secured a plate 58 having an extending tapered pin 59. This pin has a sleeve 60' loosely mounted thereon and suitably secured there A triangular scale 61 has a tapered revolve upon the pin 59 allowing the scale to be turned and various scales to be brought into usewithout the necessity of detaching.

The plate 18 is provided with a series of tapered holes 45 to be engaged by the tapered end of a pin 46 depending from the plate 36. Alink 46 connects said'pin with a lever 47 pivoted at 48 to lugs secured tothe protractor plate 35. A spring 49- engaging the I end of said lever keeps the pin 1n engagement with the holes in .the plate 18, thus 10- catingany standard angle such as 30, 45, 60 and 90 degrees, there being a hole for each respective angle. If an odd angle is de 45 sired the pin 46 i. raised and held in its raised position by means of a pin 50 mounted in a sleeve 51 in a knob 51 secured to the plate 35-. Thesleeve 51 is provided with a slot 52 for a pin 53 projecting at right an- 50 gles from the pin 50, and whenever said pin is depressed and partly turned the small pin 53 engages the s1eeve'51 and this way the lever 49 is held down and the pin 46 raised. The plate 35 can be moved an degree de- 55 sired, the graduations on said p ate registeroperating the cam lever 45 the plates 18 and 36 can be securely locked together.

It is often desirable to make a certain part of a drawin at an angle to the rest of the V drawing an use the protractor in relation thereto. The present method requires calculation, as the result cannot be read direct. To overcome this inconvenience, I provide graduations 56 on the segment gear 25 and when the screw 26 is loosened said segment can be rotated on its axis any number of degrees. Looking at Fig. 1, if said segment is moved ten degrees from vertical the segment 19 will also be moved an equal number of degrees from the horizontal and the lines will all be drawn parallel to each other, but

at a ten degree angle. For instance, the foundation line is at an angle of ten degrees to the horizontal and itis desired to draw a line thirty degrees to the base line. In the ordinary way the protractor plate 25 would be moved ten degrees to get the former line and an additional thirty degrees for the latter, or forty degrees in all. This requires time and calculation.

With my machine the ten degree angle will be obtained by moving the protractor segment 25 a distance of ten degrees and through the gear segments the plate 18 will be moved an equal number of degrees.

Therefore it is only necessary to move the protractor 35 a distance of thirty degrees. This being one of the standard angles, can be obtained by means of the hole 45 and the pin 46, or the, angle will be shown when the graduation mark 30 on the protractor is opposite the mark 54. It will not, therefore, be necessary to compute the angles of ten and thirty degrees, as required when only one protractor is used.

In various ways the details of construction herein shown and described may be modified and still be within the scope of my invention, as, for instance, the number of bars in i the differential gearing may be increased, if

desired, and provision may be made for taking up any lost motion or slack in the gearing. The addition of the bars would slmply be amplifying the construction already shown and I have not thought addltional illustration necessary.

I claim as my invention:

1. A drafting machine comprising a base plate, a drawing board whereon sa1d base plate is mounted, drafting rulers mounted at right angles to said base plate, a toothed wheel gearln mechanism connecting said plate with sa1d board andmountedfor oscillation on said board for maintainin parallel relation of the rulers lines in di erent positions of the rulers on the board.

2. A drafting machine comprislng a base plate, a drawing board whereon sa1d base plate is mounted, adjustable drafting rulers mounted at right angles on said plate, a toothed wheel gearing mechanism connecting said base plate with said board and mounted for oscillation on said board for maintaining parallel relation of the rulers lines in different positions of the rulers on the board, and protractors provided in connection with said gearing and base plate.

3. A drafting machine comprising an adjustable gear having means for mounting it on a drafting board, a base plate, an idle gear fastened thereto, a toothed gear train connection between said adjustable and idle gears, and drafting rulers mounted on said base plate for movement therewith. v

4:. A drafting machine comprising an adjustable gear having means for mounting it on a drafting board, a base plate, an idle gear fastened thereto, a toothed gear train connection, including pivoted and swinging arms, having one stationary pivot between said adjustable and idle gears, a protractor provided in connection with said adjustable gear, and drafting rulers mounted on said base plate.

5. A drafting machine comprising an adjustable gear having means for mounting it on a drawing board, a bar having a pivotal connection with said means, a second bar pivoted on said first named bar, an idle gear concentric with the pivotal connection of said bars, segment gears pivoted on said bars and having their adjacent ends meshing with said idle gear, one of said segment gears meshing with said fixed gear, a base plate geared to said other segment gear, and drafting rulers carried by said base plate.

6. In a drafting machine, a base plate, relatively fixed drafting rulers carried thereby, a protractor plate, a locking pin mounted thereon for entering holes provided in said base plate, a spring normally holding said pin in its locking position, and a plunger device for lifting said pin to release said protractor plate.

:7. In a drafting machine, a base plate, an

idle gear connected thereto, means for ad-' and an adjusting screw mounted vin the upper lug for engaging the bearings of said ruler.

9. In a drafting machine, a base plate, a protractor plate mounted thereon and a plate carried by said protractor plate and having means for attaching drafting rulers or a triangular scale thereto, said means including lugs and a clamping screw cooperating therewith. j

10. A drafting machine comprising an adjustable gear having means for mounting it on a drawing board, a bar having a pivotal connection .with said means, a second bar pivoted on said first named bar, a base plate, an idle gear connected thereto, a gear train mechanism on said bars between said idle gear and said adjustable gear, and drafting rulers mounted on said base plate.

In witness whereof, I have hereunto set my hand this 20th day ofSeptember 1917 HERMAN J. BUCK. 

